| a prefix occurring in loanwords from Greek (diabetes; dialect) and used, in the formation of compound words, to mean “passing through” (diathermy), “thoroughly,” “completely” (diagnosis), “going apart” (dialysis), and “opposed in moment” (diamagnetism). |
| dia- or di- pref.
[Greek, from dia, through.] |
dia- or di-
pref.
Through: diapedesis.
Across: diameter.
| dia-
A prefix meaning "through" or "across," as in diameter, the length of a line going through a circle. |